There have been some good suggestions given to NotCharlotte on how to let NotElvis know she is interested. Thinking back to my own ways I realized they ran the gamut from emailing to using the kissing approach. My "old" age has me wary of the process of slowly letting him know I like him and using the touching-his-arm technique. Right before my last birthday I got in the "F*&% this, I'm almost ** years old! I can't keep playing these games!" mindset. It just felt dumb for me to wait around for someone to realize I was interested. Now, don't let me kid you, I'm still way too shy to come right out and tell a guy I like him or to even ask him out but at least my realization has me moving in the right direction.
It sucks there can't be a way to let a person know without the potential for embarassment or awkwardness. So my bored mind gets the idea of an auction and the paddles they use (or at least, they use in the movies since I've never been to a real auction to witness this) to show interest in an item and to bid on it. NotMiranda has mentioned before how she wishes we had that texting capability they used to advertise where you could write to someone in close proximity.
Imagine if we had something easy like that. Just something subtle to show interest. Maybe in the future we'll have pheromones we can turn on and off depending on who is around. "Oh, NotEwanMacGregor is around? PHEROMONES UP!" and he won't be able to resist.
Until then though, PLEASE keep those ideas coming, I'm sure we could all use the advice/ideas.